Monitor arm



FIG. 1 is a first perspective view of the monitor arm embodying the new design;

FIG. 2 is a second perspective view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a back view thereof;

FIG. 6 is a front view thereof;

FIG. 7 is a top view thereof; and

FIG. 8 is a bottom view thereof; and,

FIG. 9 is a perspective view of the monitor arm showing our new design with environment.

Broken lines are used to illustrate features of the monitor arm that form no part of the claimed design. 

CLAIM The ornamental design for a monitor arm, as shown and described. 